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decade montage.png|Above title bar: events during World War II (1939–1945): From left to right: Troops in an LCVP landing craft approaching " Omaha" Beach on " D-Day"; Adolf Hitler visits Paris, soon after the Battle of France; The Holocaust occurred during the war as Nazi Germany carried out a programme of systematic state-sponsored genocide, during which approximately six million European Jews were killed; The Japanese attack on the American naval base of Pearl Harbor launches the United States into the war; An Observer Corps spotter scans the skies of London during the Battle of Britain; The atomic bombings of Hiroshima and Nagasaki are the first uses of nuclear weapons, killing over a quarter million people and leading to the Japanese surrender; Japanese Foreign Minister Mamoru Shigemitsu signs the Instrument of Surrender on behalf of the Japanese Government, on board USS Missouri, effectively ending the war.
Below title bar: events after World War II: From left to right: The Declaration of the State of Israel in 1948; The Nuremberg Trials were held after the war, in which the prominent members of the political, military, and economic leadership of the defeated Nazi Germany were prosecuted; After the war, the United States carried out the Marshall Plan, which aimed at rebuilding Western Europe; ENIAC, the world's first general-purpose electronic computer.|420px|thumb rect 1 1 224 195 Normandy Landings rect 227 1 407 195 Battle of France rect 409 1 572 195 The Holocaust rect 1 198 148 383 Attack on Pearl Harbor rect 151 198 288 383 Battle of Britain rect 291 198 420 383 Atomic bombings of Hiroshima and Nagasaki rect 424 198 572 383 Surrender of Japan rect 0 384 572 411 World War II rect 1 412 125 599 Israeli Declaration of Independence rect 128 412 290 599 Nuremberg Trials rect 294 412 438 599 Marshall Plan rect 441 412 572 599 ENIAC
The 1940s (pronounced "nineteen-forties" and commonly abbreviated as the "Forties") was a decade of the Gregorian calendar that began on January 1, 1940 and ended on December 31, 1949.
Most of World War II took place in the first half of the decade, which had a profound effect on most countries and people in Europe, Asia, and elsewhere. The consequences of the war lingered well into the second half of the decade, with a war-weary Europe divided between the jostling spheres of influence of the Western world and the Soviet Union, leading to the beginning of the Cold War. To some degree internal and external tensions in the post-war era were managed by new institutions, including the United Nations, the welfare state, and the Bretton Woods system, facilitating the post–World War II boom, which lasted well into the 1970s. However, the conditions of the post-war world encouraged decolonialization and emergence of new states and governments, with India, Pakistan, Israel, Vietnam, and others declaring independence, although rarely without bloodshed. The decade also witnessed the early beginnings of new technologies (such as computers, nuclear power, and jet propulsion), often first developed in tandem with the war effort, and later adapted and improved upon in the post-war era.